Master_Shake

Which do you value more, the new fish, or your old ones? Were I in your situation, I might side with the older fish because they were fish I had intentionally chosen, and I might have formed more of an emotional bond with them. But perhaps the new fish is more entertaining, or fufills more of my fish desires than the others. In which case I would keep the new one.

You clearly have a difficult decision on your hands.

EDIT:

I wouldn't worry about the fish eating other fish, that's what fish do. And even the special food you bought is probably organic material of some kind, so it was alive at one point and has been killed for this fish. Can you afford to continue feeding the fish live fish? And if so, do you want to? Does the fish provide you with some sense of enjoyment, fufillment or other such feeling that instills good feelings in you? If not, I say dump the sucker.

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You know something, I don't think the sun even... exists... in this place. 'Cause I've been up for hours, and hours, and hours, and the night never ends here.